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SubjectRe: [PATCH] perf: fix building error in x86_64 when dwarf unwind is on
Hi Wang,

(Adding Arnaldo and Jiri to CC)

On Sat, Dec 27, 2014 at 09:26:11AM +0800, Wang Nan wrote:
> When build with 'make ARCH=x86' and dwarf unwind is on, there is a
> compiling error:
>
> CC /home/wn/perf/arch/x86/util/unwind-libdw.o
> CC /home/wn/perf/arch/x86/tests/regs_load.o
> arch/x86/tests/regs_load.S: Assembler messages:
> arch/x86/tests/regs_load.S:65: Error: operand type mismatch for `push'
> arch/x86/tests/regs_load.S:72: Error: operand type mismatch for `pop'
> make[1]: *** [/home/wn/perf/arch/x86/tests/regs_load.o] Error 1
> make[1]: INTERNAL: Exiting with 25 jobserver tokens available; should be 24!
> make: *** [all] Error 2
> ...
>
> Which is caused by incorrectly undefine macro HAVE_ARCH_X86_64_SUPPORT.
> 'config/Makefile.arch' tests __x86_64__ only when 'ARCH=x86_64'. However,
> with 'ARCH=x86', the underlying compile may also be x86_64, which causes
> mismatching.

Hmm.. how did you compile this? I guess ARCH=x86 requires -m32 flag
to the gcc, did you pass it (like via EXTRA_CFLAGS=-m32)?

I'm confused by 'underlying compile may also be x86_64' part..

Thanks,
Namhyung


>
> This patch fixes it by checking __x86_64__ in both case of
> 'ARCH=x86_64' and 'ARCH=x86'.
>
> Signed-off-by: Wang Nan <wangnan0@huawei.com>
> ---
> tools/perf/config/Makefile.arch | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/tools/perf/config/Makefile.arch b/tools/perf/config/Makefile.arch
> index 851cd01..303a096 100644
> --- a/tools/perf/config/Makefile.arch
> +++ b/tools/perf/config/Makefile.arch
> @@ -15,6 +15,8 @@ endif
>
> ifeq ($(ARCH),x86_64)
> override ARCH := x86
> +endif
> +ifeq ($(ARCH),x86)
> IS_X86_64 := 0
> ifeq (, $(findstring m32,$(CFLAGS)))
> IS_X86_64 := $(shell echo __x86_64__ | ${CC} -E -x c - | tail -n 1)
> --
> 1.8.4
>
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